<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body dir="auto">
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Hello fieldtrip,<br>
</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">I just want to discuss my processing steps and to determine if I have made any analysis errors.<br>
</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Firstly, I have data converted from eeglab using the following code:<br>
</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></p>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> % convert to fieldtrip</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> process = 'componentanalysis';</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> data = eeglab2fieldtrip( EEG, process, 'none');<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">The data is 30 seconds of someone having their eyes closed. There are no trigger codes unfortunately.<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">I then run the ft_timelockanalysis function (to be used in tf_sourceanalysis), without any configuration settings specified (I will use the defaults).<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> % calculating the cross spectral density matrix <br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg = [];<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> timelock = ft_timelockanalysis(cfg, data);<br>
</span></div>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">The code runs fine without any errors. As it calculates the data to be one trial long, has the code done anything to do the
data. What has it timelocked to?<br>
</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">I then calculate the mri_headmodel:<br>
</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></p>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> % the forward model and lead field matrix</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> mri = ft_read_mri( 'Subject01.mri');</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg = [];</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg.write = 'no';</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg.coordsys = 'ctf';</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> segmentedmri = ft_volumesegment(cfg, mri);</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg = [];</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg.method = 'concentricspheres';</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> vol = ft_prepare_headmodel(cfg, segmentedmri);<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">I then run the source analysis code:<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> % Source Analysis: without contrasting condition</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg = [];</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg.method = 'lcmv';</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> % cfg.grid = grid;</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg.vol = vol;</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg.dics.projectnoise = 'yes';<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> cfg.dics.lambda = 0;</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"> sourcePost = ft_sourceanalysis( cfg, timelock);<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">The code also runs fine. However, what I have found is that I cant plot the data using ft_sourceplot.<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">As I am not 100% on how these functions operate and how to properly run a beamformer on continuous data, I am not sure whether<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">the step that I have taken are appropriate, or that I am kind of making it up as I go along.<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">I cant find anywhere how to do a beamformer on continuous data without trials of some sort.<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Any help will be appreciated.<br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Tyler.<br>
</span></div>
<span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></p>
<div>
<p style="margin-top: 0px; margin-bottom: 0px;"><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></p>
<div name="divtagdefaultwrapper" style="margin: 0px;">
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">*************************</span>
<div><span style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);"><br>
</span></div>
<div><i style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Tyler Grummett ( BBSc, BSc(Hons I))</i></div>
<div><i style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">PhD Candidate</i></div>
<div><i style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Brain Signals Laboratory</i></div>
<div><i style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Flinders University</i></div>
<div><i style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Rm 5A301</i></div>
<div><font><i style="-webkit-text-size-adjust: auto; background-color: rgba(255, 255, 255, 0);">Ext 66124</i></font></div>
</div>
</div>
</div>
<br>
</body>
</html>